Fixed ActivityPub reply button enabled condition (#22468)

closes AP-873

- When the textarea for a reply is populated, but not focused, the
"post" button goes grey. The user expectation is that if there's content
in the textarea then the button stays black to indicate it's possible to
click on it to post

Author: peterzimon

apps/admin-x-activitypub/src/components/global/APReplyBox.tsx

@@ -113,8 +113,7 @@ const APReplyBox: React.FC<APTextAreaProps> = ({
         className
     );
 
-    // We disable the button if either the textbox isn't focused, or the reply is currently being sent.
-    const buttonDisabled = !isFocused || replyMutation.isLoading;
+    const buttonDisabled = !textValue || replyMutation.isLoading;
 
     let placeholder = 'Reply...';
     // eslint-disable-next-line @typescript-eslint/no-explicit-any